Possible causes of a crackling sound when shifting automatic transmission gears:
Mechanical problems:
* Worn or damaged friction discs
* Faulty shift control solenoids
*Low or contaminated transmission fluid
* Worn transmission bearings or gears
* Torque converter problems
Electrical problems:
*Faulty Transmission Control Module (TCM)
* Faulty speed sensors
* Poor electrical connections
Other reasons:
* Aggressive driving or towing heavy loads
* Using the wrong transmission fluid
* Lack of proper automatic transmission maintenance
What to do if you hear a crackling sound when changing gears:
* Check the level and condition of the transmission fluid. It must be clean and at the correct level.
* Scan trouble codes. The TCM may store error codes that indicate a problem.
* Consult a qualified mechanic. They can diagnose and fix the problem using specialized tools and knowledge.
Prevention recommendations:
* Service the automatic transmission regularly as recommended by the manufacturer.
* Avoid aggressive driving and towing heavy loads.
*Only use transmission fluid recommended for your vehicle.
* Check the fluid level and condition regularly.